Stop. The window stopper is a device installed on the classroom window to limit the opening degree of the window. Its purpose and function are to prevent students from falling from the window. The window plug of the student dormitory of the Ministry of Education is a device installed on the window of the dormitory to limit the opening degree of the window. The Ministry of Education of People's Republic of China (PRC) is the the State Council department in charge of education and language work in the State Council, People's Republic of China (PRC).